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9f65ad43a6
This mainly covers the new Pixel Streaming plugin version along with minor changes to other parts of the engine: * removed multiple copies of FThread as it's now a part of Core * changes to SlateUser required to fix user input in Pixel Streaming This wasn't formally reviewed due to the size of Pixel Streaming changes, but was skimmed over by Zack Letters before integration #rb zack.letters [CL 9486237 by Andriy Tylychko in Main branch]
92 lines
1.8 KiB
C++
92 lines
1.8 KiB
C++
// Copyright 1998-2019 Epic Games, Inc. All Rights Reserved.
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/*
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Based on ScopeGuard presented at:
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http://channel9.msdn.com/Shows/Going+Deep/C-and-Beyond-2012-Andrei-Alexandrescu-Systematic-Error-Handling-in-C
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*/
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#pragma once
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#include "SessionMonitorCommon.h"
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template<class Func>
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class TScopeGuard
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{
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public:
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TScopeGuard(Func F)
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: F(std::move(F))
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, Active(true)
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{
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}
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~TScopeGuard()
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{
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if (Active)
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F();
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}
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void Dismiss()
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{
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Active = false;
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}
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TScopeGuard() = delete;
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TScopeGuard(const TScopeGuard&) = delete;
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TScopeGuard& operator=(const TScopeGuard&) = delete;
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TScopeGuard(TScopeGuard&& Other)
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: F(std::move(Other.F))
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, Active(Other.Active)
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{
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Other.Dismiss();
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}
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private:
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Func F;
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bool Active;
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};
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/**
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Using a template function to create guards, to make for shorter code.
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e.g:
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auto g1 = ScopeGuard( [&] { SomeCleanupCode(); } );
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*/
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template< class Func>
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TScopeGuard<Func> ScopeGuard(Func F)
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{
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return TScopeGuard<Func>(std::move(F));
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}
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/**
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Macros to be able to set anonymous scope guards. E.g:
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// some code ...
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SCOPE_EXIT { some cleanup code };
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// more code ...
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SCOPE_EXIT { more cleanup code };
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// more code ...
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*/
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namespace detail
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{
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enum class EScopeGuardOnExit {};
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template <typename Func>
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__forceinline TScopeGuard<Func> operator+(EScopeGuardOnExit, Func&& F) {
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return TScopeGuard<Func>(std::forward<Func>(F));
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}
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}
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#define CONCATENATE_IMPL(S1,S2) S1##S2
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#define CONCATENATE(S1,S2) CONCATENATE_IMPL(S1,S2)
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// Note: __COUNTER__ Expands to an integer starting with 0 and incrementing by 1 every time it is used in a source file or included headers of the source file.
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#ifdef __COUNTER__
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#define ANONYMOUS_VARIABLE(Str) \
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CONCATENATE(Str,__COUNTER__)
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#else
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#define ANONYMOUS_VARIABLE(Str) \
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CONCATENATE(Str,__LINE__)
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#endif
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#define SCOPE_EXIT \
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auto ANONYMOUS_VARIABLE(SCOPE_EXIT_STATE) \
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= ::detail::EScopeGuardOnExit() + [&]()
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